A very, very very very faint 'eee' noise at any brightness level less than 98%. But to all but the most sensitive ears, there's essentially no electrical noise to be heard. It's an order of magnitude quieter than the Dell SP2309W that I was using before. That monitor had audible electrical noise at anything other than 100% brightness.

Buzzes audibly in a quiet room at pretty much any common brightness setting iirc but I had it at 75 brightness. Its a replacement , the first one also buzzed and then went dead (backlight I think) after a few short weeks. First monitor thats ever died on me. Id RMA it but Ive moved country so no warranty.

This was already the problem in the LG E2350V: LED-backlight, (it even has an) external power adapter and a closed monitor housing without any ventilation holes, BUT it still had the annoyingly audible, high-pitched backlight inverter noise.

1. no buzzing but high pitch sound only heard from back of monitor and you have to go near it. otherwise not heard when sitting in front. powersupply is external, therefore you can add noise dampening pads on the back as there are no vents for a 0 dbA monitor.

2. buzzing sound but lower pitch sound hear from back.

Both monitors were at zero brightness level. i didnt notice any difference in noise level at higher brightness.

From the horror stories i hear i think this may be the best resort, find one that makes no noise when sitting in front arms length, then add noise dampening material to the back of the LCD if you absolutely want no noise. All led will probably make noise on the back, just hope its bearable.

Dell U2410Tests conducted by ear, 1 m from the monitor, in a reasonably quiet environment, sitting about 0.7 m away from the screen..... The fundamental frequency of the buzz is around 180 Hz and its sound is quite clear, with a good deal of consonant harmonics.

Oh, sorry for not making that clearer. I recorded myself humming at the pitch I was hearing and recorded the noise itself by positioning the microphone at the source of the noise (top ventilation grate, center). I got consistent results for both so I presumed it was measured reasonably well. I guessed that's something a person considering the screen would like to know.

But that's the only part of the measurement where I used a microphone, the loudness part at different brightness levels was evaluated by ear.

Acer AL2216W0-90 brightness: medium-pitched whine, audible at about 10 feet in front of the display90-95: pitched whine fades95-100: only remaining sound is a very soft wide-spectrum hum/fuzz, audible at about 2 inches from the front (maybe 12-18 inches from the back)Overall: Good! Almost silent at max brightness, and max brightness is still comfortable.

Samsung 2494LW0-99 brightness: whine is slightly higher-pitched and softer than the Acer, audible at about 5 feet in front of the display100: remaining hum/fuzz is noticeably louder than the Acer, audible at about 3 feet in front of the displayOverall: Not good for quiet settings. Max brightness is very bright and doesn't reduce the noise as much as I'd hope.

AOC 2236Vw0-89 brightness: pitched whine is the loudest of the three, audible from across the room (15+ feet)90-99 brightness: extremely soft hum/fuzz, only audible from the back right next to the vent100 brightness: dead silent, couldn't hear any noise even when my ear against the back ventOverall: Depends. Complete silence is possible with this monitor, but for me the cost is too high: max brightness is very bright AND there's significant backlight bleed at top and bottom AND the whole thing is done in a ridiculous high-gloss "piano black" finish, so there's a lot of eye assault going on.

My testing was unscientific, just careful listening in a very quiet space -- semi-rural suburb at 4:30am, well-insulated room, computers down the hall in another room.

Dell E2211Hb0-15 brightness: almost totally silent, just the slightest hum can be heard with my ear right next to the vent.15-100 brightness: a sort of "whirring" sound that gradually increases with greater brightness. It's loudest at 100 brightness, but still very subtle (only audible at a couple inches in front of the monitor, maybe 12 inches behind).Overall: Jackpot! I prefer a very low brightness anyway...

0 - 91 brightness: audible whine/buzz. When changing the brightness, the tone of the whine changes a bit but remains constantly audible. This whine is especially loud during evenings/nighttime when ambient noise is lower. It can be heard across the room (5m/15ft and more).92 - 100 brightness: no whine/buzz, silent.

Fujitsu ESPRIMOVIEW B24W-5 ECO 24"It can be heard across the room (5m/15ft and more).

That sounds horrific!

Oh, it is I thought when I buy an expensive monitor (~330€ about 10 months ago; similarly specced monitors were ~250€) it'll have quality/silent components and all, but this was not the case. Lesson learned

Samsung S27A950D no noise at any brightness. Power usage: 20w at 0% and 46w at 100%.

Only the external power brick makes strange electrical sounds which do not seem to be influenced by brightness, but only at like 30 cm range in midnight. Anyway it can be buried like 3 meters behind the sitting position so nobody will hear it.

Details: I have 3 of these monitors. Each one hums at a different volume, and only one is particularly bad. I have a black desktop background, and when I open a white document that fills the screen, the hum quiets a tiny bit. It is very noticeable because I have silenced the rest of the computer: Sound absorption foam, SSDs, fanless psu and graphics cards, large cpu heatsink with low-speed pwm fan (Scythe). I don't think LED's hum, so it must be the power supply. Any ideas how to silence it would be very welcome!

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